.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 0px 60px;
    height: 70px;
    background-color: #000;
    text-align: center;
    z-index: 100;
    @include transition(0.4s, margin);
    @include boxSizing(border-box);
    .main-logo {
        display: block;
        height: 100%;
        text-align: center;
    }
    img {
        max-height: 100%;
        max-width: 100%;
    }
    .menu-btn {
        position: absolute;
        top: 50%;
        right: 10px;
        margin-top: -20px;
        width: 40px;
        height: 40px;
        font-size: 14px;
        background-color: transparent;
        color: #FFF;
        border: none;
    }
}

@media screen and (min-width: $vw-small) {
    .main-header {
        position: relative;
        height: 200px;
        .menu-btn {
            display: none;
        }
    }
}